/**
 * Deterministic dead-PID helper for owned-lock tests (SMI-5883 §8).
 * @module @skillsmith/core/tests/helpers/deterministic-dead-pid
 *
 * Replaces the round-3 assumption that a hard-coded PID (e.g. `'99999'`) is
 * dead — flaky on any machine whose PID space reaches that value. Spawns a
 * real, short-lived child process, waits for it to exit, then verifies
 * `process.kill(pid, 0)` throws `ESRCH` before handing the PID back. Retries
 * (PID reuse) up to 5 times, then fails loudly with a clear message rather
 * than silently returning a live PID.
 */
export declare function mintDeadPid(): number;
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